CH632090A5 - MACHINE FOR AUTOMATICALLY MONITORING THE EFFICIENCY OF CONTAINER CLOSURES. - Google Patents

Description

The present invention generally relates to machines intended for automatically checking the effectiveness of profiled closure members containing a filling, for example bottle caps, and for eliminating those which do not fulfill certain predetermined shape and sealing conditions. , and in particular a machine treating in this way closing members containing an elastic seal.

It is very important, both for the last user and for the bottlers, to properly check the effectiveness of the bottle-closing members, which, for simplicity, will be simply referred to as closure. This is important for the user, because of possible leaks from these closures, which allow the contents of the bottle to spoil and escape. It is also important for the bottler, on the one hand, for the

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the same reasons and, on the other hand, because faulty closures can cause modern bottling machines that work at high speed to lock in.

Caps for corking bottles are manufactured at high speed using mass production techniques, but the rate at which they are checked is generally limited by the speed at which they can be inspected and handled by humans. The machines used in the trade and intended to pose waterproof seals out of plastic material in capsules previously formed and intended to close bottles, for example like those which describe the patents US Nos 3135019 and 3360827, can work at the rate of 1400 capsules / min. As a result, most capsule manufacturers control only a small proportion of the jacketed capsules and make a statistical extrapolation of this operation for the entire production. This subjective technique takes time and is inherently unsafe.

Likewise, most bottlers only control a small proportion of the capsules purchased. In general, they only inspect the capsules in a box in each shipment, and if the number of defective capsules in that box exceeds the maximum figure they have determined, they refuse the entire shipment.

The present invention relates to methods and a machine intended, on the one hand, to automatically control the effectiveness of profiled closures and containing a lining, on the other hand, to eliminate those which do not fulfill certain predetermined conditions of shape and sealing. The machine according to the invention is defined by claim 1, the method for actuation by claim 10. In general, the closures each contain an elastic seal. A distributor sends them to a control station which contains, on the one hand, one or more sockets each intended to house and hold one of them, on the other hand, one or more corresponding control nozzles each intended for fit into the internal cavity of a closure. The external profile of each of these nozzles corresponds roughly to the ideal profile of the closure cavity, so that when entering the latter, it indicates whether or not it conforms to this ideal. Each of these control nozzles preferably communicates with a source of the pressurized fluid, in order to check both the depth of its penetration and the effectiveness of the sealing ring. The machine automatically lets through closures capable of sealing for a predetermined pressure, and it automatically eliminates those that do not meet this condition. This memo describes in detail an advantageous embodiment of a machine intended to check the condition of bottle caps from several machines in which these capsules have received their internal lining.

The invention will be described in more detail with reference to the accompanying drawings by way of non-limiting example and in which:

fig. 1 schematically represents an advantageous embodiment of an automatic control machine according to the invention;

fig. 2A and 2B complement each other and are a section along line 2-2 of fig. 1;

fig. 3A and 3B, which complement each other, are a plan view of the pickup and transport mechanism;

fig. 4 is a section along line 4-4 of FIG. 3B;

fig. 5 is a section along line 5-5 of FIG. 3B;

fig. 6A to 6E show a cooling station which is used in the machine of FIG. 1;

fig. 7 shows, partially schematically, a control station used in the machine of FIG. 1;

fig. 8 shows in section a control nozzle usable in the control station of FIG. 7;

fig. 9A to 9D show how the control of suitable capsules and unacceptable capsules of various types is done;

fig. 10 shows a pneumatic circuit which can be used in the control station of FIG. 7;

fig. 11 shows a counting device which can be used in the machine of FIG. 1.

Fig. 1 schematically represents an embodiment of an automatic machine according to the invention, machine intended in this case to control the effectiveness of capsules intended to stop bottles and coming from several machines 9 which have installed there tight seals in material plastic. The machine in question essentially comprises, on the one hand, one or more mechanisms 10 intended to take, on leaving the machines 9, hot capsules and containing a plastic lining, on the other hand, corresponding transport mechanisms 11 intended to convey these capsules from the first 10 to a same cooling station 12 in which, after their temperature has been brought between predetermined limits, they are arranged in one or more rows and conveyed to a control station 13.

In the latter station 13, the capsules are placed in sockets or housings, and their control is ensured by means of nozzles which fit into the cavities which they form internally. The tightness ensured with respect to a pressurized fluid by the annular lining of each capsule in cooperation with the corresponding control spout makes it possible to check both its effectiveness and the depth of penetration of this spout into this capsule, which shows to what extent the capsule profile conforms to an ideal profile. Defective capsules are discarded in a container 14, and those that are acceptable go to a packing station 15 where they are counted and placed in suitable containers. The mechanisms and positions considered to be advantageous in the context of the invention will hereinafter be described in detail, with reference to FIGS. 2 to 11.

The collecting and transport mechanisms essentially have the function of taking the capsules leaving one of the machines which have placed their internal linings at their commercial production rate and of moving them a little away from the latter. In addition, the machine advantageously comprises, on the one hand, a device intended to detect and eliminate excessively defective capsules which could then cause the mechanisms of the control system to be engaged, on the other hand, a device intended to detect the blocking pickup mechanisms and, in this case, to automatically stop the corresponding machine 9. In addition, the pick-up mechanism preferably aligns the capsules in order to bring them properly to the transport mechanism which follows it.

Figs. 2A, 2B, 3A and 3B show a pick-up mechanism 10 which is intended to take the hot and jacketed capsules 20 on leaving the machines 9. This mechanism 10 comprises a conveyor belt 21 made of non-magnetic material, for example neoprene, which passes over and in the middle of one or more strips 22 of magnetic material. The centrifugal force ejects from the machines 9 the capsules whose concavity faces upwards. The magnetic field of the bands 22 contributes to pass these capsules from the machine 9 over the belt 21, preventing them from turning over and keeping them in contact with and in the middle of this moving belt, that is to say at the - above the bands 22.

A photoelectric cell 23, which acts as a prior checking mechanism, detects excessively defective capsules or groups of capsules whose height exceeds a predetermined value. This cell is connected by a suitable delay line to a pneumatic tube 24 which automatically drives these too high capsules into a disposal container 25. The device can also optionally include a manual switch 26 intended to actuate the tube 24 so that it sweeps and drives out all the capsules, which is advantageous, for example, during the starting of the machines 9, starting during which these machines sometimes produce a high proportion of defective capsules.

At the end of the belt 21 which is close to the entry of the transport mechanism 11 is a clutch or blockage detector, in this case a door 27 to snap. Any significant accumulation of capsules under this door generates upward pressure which triggers its opening, ensuring the exit of the capsules and actuating a microswitch which prolongs the stopping of the corresponding machine 9.

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A pneumatic nozzle 28 forces the capsules to pass through the belt 21 in the transport mechanism 11.

The pick-up mechanisms 10 move the capsules a little away from the machines 9 so that their accumulation does not interfere with the operation of the latter, but the transport mechanisms 11 take them out of the latter 10 by moving them away to a location allowing to carry out the following operations of cooling, control and packaging without interfering with the operation of the machines 9. Suitable transport mechanisms have the essential advantage of making it possible to transport the capsules leaving several machines 9 to a single station remote cooling and then pass them through a single control station and a single packing station.

Figs. 1 and 5 show a transport mechanism 11, constituted by a guide 30 and an automatic tubular collector 31. The first 30 preferably forms, on three sides, a guide path for a single capsule. The second 31, which can be placed in the middle and above the first 30, that is to say on the fourth side, comprises several pneumatic conduits 32 which, inclined axially, eject several air streams into the axis of this guide 30. These air currents drive the capsules along the guide 30 which can optionally internally form progressive curves,

to bring them to the cooling station 12. The guides 30 preferably all have the same length so that the capsules leaving the different machines 9 reach this station 12 at substantially the same temperature.

The essential function of the cooling station 12 is to gradually bring the hot capsules to a temperature between predetermined limits before the control operation. This cooling is desirable to allow the plastic seal, and in general thermoplastic, to solidify enough so as not to undergo permanent deformation during its inspection and to effectively ensure the seal without adhering to the control members. The cooling station should preferably also be able to distribute the capsules reaching it in rows so that they appear in this way when they pass through the control station 13.

Figs. 6 A to 6E represent a cooling station 12. This station includes a device for conveyor belts 40 which may consist of a wire mesh coated with neoprene. This conveyor, which moves more slowly than that of the pickup mechanism 10, slowly brings the capsules exposed to the ambient air to the control station so as to allow them to cool. It is optionally possible to place covers 41 of transparent plastic material above this conveyor 40 in order to prevent too rapid cooling of the capsules. In this case, this cooling conveyor 40 moves at a rate of 15 m / min and makes the capsules travel a distance of about 2.40 m in order to bring them to a temperature of about 50 ° C.

From one end to the other of the control operation, it is advantageous to keep the capsules which come from each of the machines 9 separated from each other in order to allow rapid identification of which of the latter which is operating in a defective manner. . In the cooling station, this separation can easily be ensured by means of vertical and transversely spaced partitions 41A (FIG. 1) which keep the capsules conveyed by the different guides 30 separate from each other and divide the conveyor into several conduits 40A ( fig 1) transversely spaced, each of which communicates with the outlet of the corresponding machine 9.

To distribute the capsules on the conveyor and then arrange them in rows, elastic shock absorbers 42, for example made of neoprene, are placed on the path of the capsules coming from each of the corresponding guides 30, a few tens of centimeters from the outlet of these guides on the cooling conveyor. It is convenient to suspend these shock absorbers 42 from the plastic cover 41. Projected at the exit of the guides 30 on the conveyor, the capsules collide with the shock absorbers on which they rebound to be distributed randomly across the conveyor 40 in the corresponding conduits 40A.

Several orientation partitions 43, preferably suspended from the covers 41, force the randomly distributed capsules to align longitudinally in several transversely spaced rows so that they thus appear at the checkpoint. To prevent them from jamming near the leading edges of these partitions 43, agitators in the form of rotary elastic flails 44 are placed halfway between the adjacent partitions 43, a little in front of their edges. 'attack. These plagues can advantageously be subjected to the same rotary shaft 45 situated above the covers 41, and they pass from top to bottom of the buttonholes drilled in these covers. Of course, their direction of rotation is such that they drive the capsules between the partitions 43.

î s The cooling conveyor ends with a fixed plate 46 and a flexible door (47 in fig. 7), intended to align transversely the first capsules of the different queues just before their passage through the control station. One or more tubular collectors 48, oriented transversely, eject air streams intended to pass the capsules from the cooling conveyor to the flexible door 47 along the conduits delimited by the adjacent partitions 43 arranged across the fixed plate 46. The capsules of the different lines are thus presented in transverse rows opposite crenellated cylindrical sectors 50 which form part of the control station 13. In this case, there is only one cooling conveyor for several machines 9 , but it is obviously also possible to use several independent ones.

The essential function of the checkpoint is to allow only suitable capsules to pass through.

Fig. 30 7 represents a control station 13. The latter comprises one or more members, in this case crenellated sectors 50, intended to pass the capsules leaving the cooling station through the door 47 into one or more housings 51, which hold them during the control operation during which one or more control nozzles 52 fit into the internal cavities of these capsules.

The crenellated sectors 50 transversely form a row in which their spacing corresponds to that of the capsules of each of the successive rows. Similarly, a chain 53 supports 40 bars which each form a row of transversely spaced sockets 51. It is obvious that the capsules leaving each of the transverse conduits 40A of the conveyor 40 pass through the corresponding transverse parts of the row of sockets.

45 The control nozzles 52 are preferably arranged in one or more transversely spaced rows, and mounted on a crosspiece 54 which causes them to come and go, that is to say to enter or exit the capsules contained in the sockets.

Figs. 7 and 8 show the conformation of a socket 51 so intended for the control of capsules with corrugated peripheral edges. The main characteristics of this socket are, on the one hand, a cavity 60 whose diameter is sufficient to allow it to contain a corrugated capsule, on the other hand, an orientation member, for example a pin 61 intended to determine the circumferential position 55 of the capsule, finally a hole or conduit 62 intended for the passage of a pneumatic or mechanical ejector, for example two rejection fingers 63.

Fig. 8 shows a structure of a spout 52 intended to control corrugated capsules. This block comprises a profiled section 70 intended to be inserted into a capsule and whose peripheral conformation corresponds roughly to that of the internal wall of a perfect capsule, so that its penetration into the capsule considered measures how far its conformation approaches the ideal. This spout 52 communicates through a conduit 64 with a source of pressurized fluid 65 (not shown) and O-rings 65 provide sealing where necessary.

The main part of the control spout, that is to say that which is intended to verify the conformation of the capsule, is constituted by

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control and a position located under the ejection ducts or chutes. A restoration pulse, that is to say a breath of air at 345 kPa, then reaches the distributor 101 through a conduit 111 in order to close this distributor. The operating rhythm of the pulsating sources is preferably adjusted by switches 110 controlled by cams integral with the shaft which drives the chain 53.

The restoration of the distributor 100 is automatically ensured by the conduit 106 in which the fluid circulates at a pressure of 103 kPa when the control nozzle leaves the capsule.

The operating principle of this arrangement has the advantage of guaranteeing against the shipment of defective capsules. Indeed, if it happens that a capsule is not ejected, it is a suitable capsule, and it is obviously better to eliminate a suitable capsule than to send a defective capsule.

Fig. 1 shows the packaging station of the machine, a station whose function is to put a predetermined number of capsules in good condition in suitable packaging, for example in cartons. In this case, the troughs or ejection tubes 56 make rows of counters 115 pass through the appropriate capsules at the outlet from which pass them into cardboard boxes a loading device constituted, for example, by doors 116 that it is possible to order. The capsules pass through these doors 116 in one or more cartons 112 placed on an adjustable platform 113 to shake. The counting of a predetermined number of capsules, for example ten large ones, can automatically trigger the operation of this platform in order to reduce the congestion of the capsules, and the counting of the total and predetermined number of capsules intended to fill a carton can automatically cause movement of door 116 in order to deposit the following capsules in a different carton.

There are several machines 9 and a corresponding number of doors 116 so that the capsules emerging from each of the first are packed in a well-defined and easily identifiable carton. In particular, the troughs or ejection tubes 56 are distributed in several beams 114 (that is to say four, two of which are visible in FIG. 1), each of these beams being made up of tubes whose transverse positions are as they guide the capsules arriving at the checkpoint from the single corresponding 40A conduit. Each of these bundles brings acceptable capsules to a well-defined door 116 which only lets through the capsules coming from a machine 9 also determined and therefore identifiable.

Fig. 11 shows an advantageous network 115 of counters which is intended to control conventional doors 116 and shaking platforms. It can be seen in this figure that the counting device comprises tubes 200 each of which contains two photoelectric cells 201 intended to detect light rays which cross almost perpendicularly. These rays are emitted by light sources 202, each of which cooperates with several neighboring tubes. The two photoelectric cells can advantageously be connected in series so that the passage of a single capsule generates only one output pulse, and the output signals of each of these pairs of photoelectric cells reach the corresponding inputs of a device with parallel inputs and serial outputs, the output signal of which itself reaches a conventional counter (not shown).

The machine according to the invention, which has just been described and shown, is intended to control capsules or closings of containers just before their dispatch; but, with a few modifications, it can also be used by bottlers or intermediate buyers to check the condition of these closures before they are placed on the containers in question. In this case, the machines 9 in fig. 1 by one or more conventional hopper distributors. In such devices, it is preferable to directly couple the outlet of the hopper to the pneumatic transport mechanism and, consequently, to remove the pick-up mechanism 10 of FIG. 1.

It is advantageous to control capsules with an internal lining of plastic material at a temperature slightly above ambient temperature in order to increase the elasticity of the plastic material and, consequently, to improve the efficiency of the control. As the capsules to be checked by a bottler or an intermediate purchaser are normally at room temperature, it is possible, if desired, to make cooperate with a transporter similar to the cooling transporter 40 of the overhanging lamps intended to bring the capsules to the desired temperature, for example around 50 ° C. Consequently, station 12 can more generally be considered, in the context of the invention, as a temperature adjustment station, that is to say intended either to heat or to cool the closures as required. in order to bring them to a temperature between certain limits before carrying out the control operation. It is advantageous to carry out this operation by means of a conveyor which passes the capsules or the closures considered in a medium which heats or cools them.

It may also be desirable, instead of repacking controlled closure capsules, to pass them directly into an automatic bottling machine, in which case it is possible to replace the packaging cartons with a conventional hopper dispenser through which pass these closings.

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an annular row of projections 70a in the form of a sawtooth whose dimensions and peripheral distribution correspond to the desired undulations of the rim of the capsule. The depth of penetration of the spout as well as the effectiveness of the seal of the capsule are checked together by means of a projecting end 72 of the spout, end pierced with a hole 73 intended for the passage of the fluid under pressure. This hole is preferably in the form of a ring, the diameter of which is approximately the same as the normal diameter of the annular sealing gasket 20a of plastic material of the capsule. The section 70 comprises, preferably at its base, grooves 74 which allow the fluid to escape in the absence of the lining 20a. An elastic return member, for example a spring 75, elastically brings the elements 70 and 72 of the control spout into contact with the capsule, and preferably the hole 73 in contact with the annular sealing gasket 20a. The force exerted by this spring corresponds to approximately 138 kPa.

The chain of bars 53 is driven so as to pass step by step under the spouts 52 and to stop during the control operation, that is to say while these spouts 52 penetrate into the underlying capsules and come out. Once they are out, the chain advances a suitable number of rows of sockets in order to place under the spouts 52 new capsules. As the chain advances, the crenellated sectors 50 rotate in order to take other capsules which they drop into the sockets 51 for the following control operation and, as the already controlled capsules leave their position under the spouts control to move to the next rest position, the appropriate capsules are ejected into tubes 56. The intermittent advance of the chain 53 is ensured by means of conventional mechanical coupling and guiding techniques which also ensure movement coordination of this chain, of the rotation of the crenellated sectors and of the back-and-forth movement of the control spouts 52, so as to cause the capsules picked up by the crenellated sectors to fall into the sockets as well as to bring the spouts 52 into the capsules retained in the sockets and to remove them therefrom. The reciprocating movement of the reject fingers 63 can be suitably synchronized with that of the control nozzles 52.

In an advantageous embodiment of the machine intended to control the capsules leaving four machines 9, the longitudinal as well as transverse spacing of the successive casings is approximately 4 cm. Two of the lines of 24 nozzles 52 simultaneously control 48 capsules during a cycle the duration of which is approximately half a second.

Figs. 9 A, 9B, 9C and 9D, which respectively show how a control spout enters a suitable capsule as well as into various typically unacceptable capsules, make it possible to understand how the control spouts 52 work.

Fig. 9A shows the control of a suitable capsule. The penetration depth of the nozzle 52 corresponds to a suitable predetermined value, and the annular lining of the capsule seals it for a predetermined pressure which is in principle approximately 103 kPa.

Fig. 9B shows the control of a capsule which is unacceptable because it does not contain a seal. The penetration depth of the spout is suitable in this case, but the seal is not guaranteed and the air escapes from the capsule at 74.

Fig. 9C shows the control of a capsule which is unacceptable as a result of the application of a double thickness of plastic material during its filling, which has formed a projection 80 around its orifice. The depth of penetration of the spout as well as the seal provided are not suitable.

Fig. 9D shows the control of a capsule which is unacceptable due to the fact that it has a bent portion 81. Here again, the depth of penetration of the spout and the seal are not suitable. It can therefore be seen in this case that a good seal provides information relating to the correction of the shape of the capsule as well as to the effectiveness of the seal, a threshold element being able to use this information to accept or eliminate the capsule in question.

Fig. 7 also shows that, if the effectiveness of the seal conforms to empirically predetermined acceptance criteria, a memory or a suitable timer employs the pneumatic nozzles 55 so that they then eject suitable capsules in the tubes or chutes 56 which bring them to the packing station 15. On the other hand, any unacceptable capsule detected is not ejected, but continues on its way around the belt until it falls into boxes disposal. The machine can optionally include a stripping pliers comprising rigid rejection fingers 63 and the movement of which is synchronized with that of the chain 53, these fingers pushing the unacceptable capsules so as to ensure their rejection by passing them through holes 62. It is preferable to provide several disposal receptacles which each receive the defective capsules which each of the conduits 40A routes. In this way, each of these containers contains the defective capsules from a well-defined machine 9.

In essence, the assembly which, corresponding to the control process, is intended to eject the capsules, comprises a device intended to determine whether or not it is possible to establish a predetermined pressure between each control nozzle and the closure or closure control; a device which, coupled to this detector, stores the information in question until the closure leaves its location under the control spout; finally, an ejector which, actuated by the latter device, ejects only suitable capsules.

Fig. 10 shows an advantageous pneumatic ejection assembly which comprises a detection distributor 100 sensitive to the seal or non-seal between the control spout and the closure; a storage distributor 101 which is sensitive to the state of the preceding 100; finally, a supercharging unit 102 which, sensitive to the state of the distributor 101, is intended to eject the suitable closings when they have come out from beneath the control nozzles.

The machine works as follows: each control nozzle enters a capsule with the gasket, which in principle must come into tight contact. A pressurized fluid then passes between this spout and this lining, the pressure exerted on it increasing to a predetermined value. In this case, the control nozzle communicates with a source of compressed air at a pressure of approximately 138 kPa through a conduit 103 in which a throttle 104 reduces this initial pressure to approximately 79 kPa, while allowing it to gradually rise towards 138 kPa.

A conduit 105 communicates with the seal, between the control spout and the closure, the inlet of the distributor 100 which keeps closed the fluid which, passing through a conduit 106, comes from a source where the pressure exerted on it has the predetermined value which corresponds to a satisfactory seal, in this case approximately 103 kPa. If the seal of the aforementioned seal is suitable, the pressure at the inlet goes from 79 kPa to a value greater than 103 kPa, which has the effect of moving the distributor valve 100 which opens to the right. If the seal is not suitable, this dispenser 100 remains closed.

The opening of the dispenser 100 has the effect of causing that of the dispenser 101, the inlet of which communicates with the outlet of 100 through a conduit 107. When the dispenser 100 is open, the inlet of the dispenser 101 is placed in communication with a source. of compressed air at 345 kPa through the conduit 107 and a conduit 108, which has the effect of moving to the right the drawer of this distributor 101 which opens and which is temporarily maintained in this state by a stop member 109.

Opening the dispenser 101 has the effect of causing the ejection of suitable capsules. This opening communicates the boost valve 102 with a pulsating source of compressed air at 414 kPa, the pulsations of this air coinciding with the movement of the controlled capsule between its position under the nozzle.

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Claims (10)

632,090 1. Machine for automatic control of the effectiveness of container closures, each of which internally forms a cavity, the machine comprising a device for distributing closures to a device for controlling closures, comprising at least one control spout positioned so that it fits into the closure cavity, a detector connected to the control nozzle to detect the presence or absence of certain physical characteristics of the internal closure cavity which correspond to an acceptable closure, and a sensitive evacuation device the detection of an acceptable closure having said characteristics, so as to eject the acceptable closures out of the distribution device at a first ejection station and to eject unacceptable closings not exhibiting said characteristics at a second ejection station, characterized in that the control device comprises a device intended to apply a fluid to each control spouts under a determined pressure, in that each control spout has a configuration in relation to the interior of acceptable closures having said characteristics to form a fluid-tight seal capable of withstanding the determined pressure, and in that the detector is mounted between the control nozzles and the evacuation device to detect the pressure generated at the nozzles and actuate the evacuation device in order to eject the acceptable closures from the distribution device when the closures are at the first station ejection. 2. Machine according to claim 1, characterized in that the dispensing device comprises at least one socket housing and successively retaining the closures during their inspection, their cavity being turned towards the outside of the socket and in that the device d the evacuation comprises an ejector ejecting the closures of the sockets after their control, the ejector comprising an ejection orifice extending inside each socket at a point communicating with the closure which is retained therein to allow the application of an ejection force at said closure in a direction pushing the latter out of the socket, ejection tubes placed in alignment with each of the ejection orifices of the sockets and a member for applying an ejection force to the acceptable sockets in order to eject them from the dispensing device. 2 3. Machine according to claim 2, characterized in that the ejector located at the first ejection station is pneumatic. 4. Machine according to one of claims 2 or 3, characterized in that the evacuation device further comprises a secondary ejector placed at the second ejection station, in alignment with each of the ejection orifices of the sockets, for applying an ejection force to each of these containing an unacceptable seal in order to eject the closure of the dispensing device. 5. Machine according to one of claims 1 to 4, characterized in that each control nozzle comprises a detector part having a periphery corresponding to the internal conformation of an acceptable closure, a channel passing through the detector part to communicate with the device pressure generator and having an outlet placed inside its periphery to allow the passage of pressurized fluid in the center and inside of the closure being checked, and a sealing surface located at the base of the detector part radially outside the outlet of the channel to establish a seal against the inside of the closure. 6. Machine according to claim 5, in which each of the formations to be inspected internally has an elastic plastic lining comprising a projecting sealing ring near its periphery, characterized in that the outlet of the channel passing through the detecting part of each control spout has an annular shape and is aligned directly with the packing sealing ring when the control spout is engaged in the closure. 7. Machine according to one of claims 5 or 6, intended to control closings having a wavy skirt, characterized in that the periphery of the detecting part of each control nozzle has an annular series of projections in the form of saw teeth of size, shape and circumferential distribution corresponding to those of the corrugated skirt of acceptable closures, so as to marry them during the control of the latter. 8. Machine according to one of claims 2 to 7, intended to control closings from several machines intended to coat them internally with an elastic lining, characterized in that the device for distributing closures has several sockets arranged in oriented rows in the direction of movement in the direction of the control device, in that the control device comprises several spouts arranged transversely to the direction of movement of the closures, a spout being aligned with each of the rows of closures, and in that the dispensing device includes guides intended to collect the flow rate of each filling machine in the form of separate rows and to maintain the separation of flow rates during the distribution of closures to the control and evacuation devices. 9. Machine according to claim 8, characterized in that the control device and the discharge device are arranged at a distance from each other along the movement path of the closures, and in that the device evacuation comprises a control device mounted between the detection device and the ejection device for actuating the latter in synchronism in order to eject the closures which are detected as being acceptable when they are at the first ejection station and in order to '' eject unacceptable closures when they are at the second ejection station. 10. A method of actuating the machine according to claim 1 for the automatic control of the effectiveness of container closures, each of which internally forms a cavity, consisting in successively distributing the closings from a source to a control device and an evacuation device, to control the interior of each closure, to determine the presence or absence of certain physical characteristics of the interior of the closure corresponding to an acceptable closure and to eject the acceptable closures at a first station d ejection and unacceptable closings at a second ejection station, characterized in that it consists in positioning each of the closings to the control device so that its cavity communicates with a source of pressurized fluid, to establish a seal between the periphery of the closure cavity and a channel connected to the fluid source, to apply the fluid inside the closure under lower pressure than that capable of breaking the seal when the latter is established along the periphery of the acceptable closure, but greater than that capable of breaking the seal of an unacceptable closure, of detecting the pressure generated in the closures, and of ejecting the closings acceptable at the first ejection station and unacceptable closings at the second ejection station, in response to detection of the pressure generated in the closures.